4. FACILITY ACQUISITIONS (Details - Purchase allocation) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock issued for acquisition, value		$ 9,241
Goodwill		$ 239,408	$ 200,304	$ 196,395
Diagnostic Imaging Group, LLC [Member]
Cash consideration paid	$ 54,555
Stock issued for acquisition, value	8,325
Consideration transferred	62,880
Accounts receivable, net	12,346
Prepaid assets and other current assets	377
Property and equipment	17,959
Goodwill	40,035
Other intangibles	50
Obligations under capital lease	$ (2,948)